Rough-and-tumble Texas ranch girl Becca Jo Cartwright drives a pickup, carries a gun and dreams of a bull-riding championship—until she shoots a harassing creep in a bar alley. Instead of bleeding, he dissolves into black mist. Soon after, she is abducted to remote Castle Dracomir, ruled by 300-year-old vampire lord Lucien Dracomir. Pressured by his mother Elizabeth to wed a pureblood countess, Lucien hires the unpolished Becca as his fake fiancée for three months to defy his mother, clearing her ranch loan debts in return.
Unknown to Lucien, Becca descends from Europe’s famed vampire hunter Rosa; her blood strikes fear into dark creatures. She cures her cursed brother, fends off besieging werewolves with a silver candlestick, and forges holy silver to save poisoned Lucien, unveiling her elite hunter insignia. Elizabeth allies with pureblood nobles to try her, while Vatican exorcists arrive to purge her. Becca reveals her grandfather heads the Hunter Association and swears to shield the vampire clan. Beneath moonlight, Lucien proposes she be his guardian. Becca quips: “This role’s gonna cost extra.”
